Drill-steel-retaining device



Nov. 1, 1927.

C. A. HULTQUIST DRILL STEEL RETAINING DEVICE Filed Jan. 12. 1927 ATTORNEY Patented Nov. 1, 1927.

UNITED STATES PATENT OFFICE.

C ARLES A. HULTQUIST, or Los ANGELES, CALIFORNIA.

DRILL-ST EEL-RETAINING DEVICE.

Application filedJ'anuary 12, 1927i Serial No. 160,642.

4 of the drilling machine,the legs of the device being forked and provided with bearings at the inner ends of the forked portions and with slidable bearings mounted on the furcations of the forked portions, the

=' slidable bearings of each leg being retained against the pivot means of the machinefby pairs of light compression springs mounted over'the furcations of the forked portions, said springs being made as resilient and as light as possible to reduce to a minimum crystallization of the spring means which often takes place When single, heavier springs are used; and, second, to provide, as a whole, a novelly constructed drill-steel retaining' device and one which is simple and economical of construction, durable, efiic'ient, practical and which will not readily deteriorate or get out-of order.

With these and other objects in- View as will appear hereinafter, my invention con sists of certain novel features of construe ti'on, combination and arrangement of parts and portions, as will be hereinafter described in. detail and particularly set forth in' the appended claims, reference being had to the accompanying drawings and 'to the charactersofreference thereon which form av part of this application in which:

Figure 1 is a side elevation view of a conventional drilling machine with my'drillsteel retaining device mounted thereon and shown in a steel retaining position thereon,

a drill steel being shown'in the barrel ofthe machine and, Fig. 2 is an enlarged'fraginentary side elevational view thereof taken at 22 of Fig. 1, showing particularly my drill-steel retaining device and showing also my device by dotted lines in an angular or out-0f-the-Way position for removing. the

' drill steel.

vLike characters of reference refer to similar parts and portions throughout the views of the drawings.

The drilling machine, indicated by the character 1 in the drawings, may be of any' suitable construction or type of reciprocating drilling machine. The drilling machine is provided, in conventional construction, at. .its lower end with a barrel 2 in which is inserted the one end of a drill steel 3 which is provided with a shoulder, or abutment, 4

from the end of the drill steel inserted in the barrel. The drill steel is permitted to slide readily in and out of the barrel 2, when the retaining device, to be described hereinafter, is not in such position as to prevent'such movement of the drill steel."

The retainer, or retaining device, indicated by R in the drawings, is generally U-shaped" and pivoted with its legs, indicated by 6, at the opposite sides of the barrel 2. At the cross, or connecting portion of the arms or legs 6 of the U-shaped retainer,-is a-transversely'slo'tted, or a transversely extending semi-circular, or U-shaped, abutment 5.

Said abutment 5 partly surrounds the drill steel when the'i'et'ainer is in a downward or retaining position, and is adapted to 'be engaged by the outer face of theab'utmentof the drill steel, during the drilling operation, to retain thed'rill steel in the barrel. The ends of the legs of the semi-circular, or

U-shaped abutment 5 are provided with upwardly extending lugs 5 to absolutely pre vent the retainer from being shifted out of the way when the drill steel is inserted into the barrel with its shoulder, or abutment, l

against the abutment 5.

The legs 6 are enlarged transversely and laterally intermediate their ends and are bifurcated, or forked, at said enlarged portions, the furcations extending toward the ends of the legs and parallel to each other and to the general direction thereof. The planes extendingthrough the furcations of each leg are perpendicular to the plane extending through the two legs 6. The'inner' ends of the bifurcated portions, or forks, of

said .legs provide semi-circular bearings 6 which are positioned against and around the undersides of studs 7 projecting laterally from the sides of the barrel 2 and in align meii't with the axis of the barrel. The barrel 2 is provided at its opposite sides with bosses 2*" adjacent and around the studs 7,

the outer faces of said bosses being engaged by the adjacent .sides of the enlarged portions of the legs 6 for positioning the retainer against lateral movement. The furcations, indicated by 6 of the retainer are in the form of bolts and serve as guides. On the furcations of each leg is slidably mounted a bearing plate 8 which is normally positioned against the upper side of the stud 7 in opposed relation to the bearing portion 6. At the outer ends of the furcations of each leg is adjustably mounted a spring retaining plate .9 which is held in position on said furcations by nuts 10 screwed onv to the outer ends of the furcations. Between the plates 8 and 9, and around each of the furcations, or bolts 6*, are positioned compression springs 11. These springs are relatively light so as to reduce crystalliza-.

tion of the springs to a minimum. The use of two springs 11 on each of the furcations provides balancing of the force against the slidable bearing 8 and avoids binding of the same on said furcations. At the upper sides of the spring retaining plates 9, around the portions through which the furcations extend, are provided upwardly extending rounded lugs, or ridges 9 which radiate out- Wardly from theholes therein. Said lugs, or ridges are adapted to extend into correspondingly shaped radial slots 1O at the inner sides of the nuts 10 to lock said nuts against unscrewing.

The upper side of one, or both, of the studs 7, is provided with longitudinal, substantially semi-circular depression 7 a into which extends, when the retainer is in a steel retaining position, a correspondingly shaped projection, or ear, 8 which extends downwardly from the middle portion of a circular depression 8 into which the upper side of the pivot portion, or stud, 7 normally extends. Thus, I

the retainer, or retaining device, is locked relative to the pivot means by the interlocking means of the studs 7 and the plates 8 against movement, unless considerable force is brought to bear against the lower end of the retainer, and only when the abutment 4 is clear of the lugs 5% Though I have shown and described a particular construction, combination and arrangement of parts and portions, I do not wish to be limited to this particular construction, combination and arrangement, but desire to include in the scope of my invention the construction, combination and arrangement substantially as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The combination with the barrel of a drilling machine, and a drill steel in the barrel, of a pivot means extending to the side of said barre a drill-steel retainer having a portion at the end of said barrel engageable by an abutment on said drill steel and having means extending to the side of said barrel, said means having a bifurcated portion straddling said pivot means and having a hearing at the inner endof said bifurcated portion engaging the underside of the pivot means, a bearing member slidably mounted on the furcations of the bifurcated portion and engaging the upper side of said pivot means, said bearing member and pivot means having portions adapted to hold the retainer in a drill-steel retaining position, nuts at the ends of said furcations, and compression springs mount-ed around each of said furcations and positioned between'said bearing member and said nuts. 2. The combination with the barrel of a drilling machine, and a drill steel in the barrel, of apivot means extending to the side of said barrel,-a drill-steel retainer having a portion at the end of said barrel engageable by an abutment on said drill steel and having means extending to the side of said barrel, said means having a bifurcated portion straddling said pivot means and having a bearing at the inner end of said bifurcated portion engaging the underside of the pivot means, a bearing member slidably mounted 011 the furcations of the bifurcated portion and engaging the upper side of said pivot means, said bearing member and pivot means having portions adapted to hold the retainer in a drill-steel retaining position, a

spring retaining plate slidably mounted on and between said furcations, nuts at the outer ends of said furcations for holding said spring retaining plate in position thereon, and compression springs mounted around each of said furcations between said bearing member and said spring retaining plate.

3. The combination with a barrel of a drilling machine, and a drill steel in the barrel, of studs projecting laterally from the barrel in alignment therewith, a U-shaped dri1l-steel retainer, the legs thereof having forked portions forming, at their inner ends, bearings engaging the under sides of the studs, the connecting portion of the legs of the U-shaped member being engageable by an abutment on said drill steel, bearings slidably mounted at their opposite ends on the furcations of each leg, said bearings and said studs having portions adapted to interlock with each other and hold the retainer in a drill-steel retaining position, spring retain ing plates slidably mounted on and between the furcations of each leg, nuts at the outer ends of said furcations for holding said spring retaining plates in position, and coin pression springs positioned around each of said furcations with their ends between the end portions and adjacent sides of saidbearings and said plates.

4:. The combination with the barrel of a drilling machine, and a drill-steel in the barrel, of studs projecting laterally from the barrelin alignment therewith, a U-shaped drill-steel retainer, the legs thereof being considerably enlarged intermediate their ends and provided With forked portions extending from the enlarged portions toward the ends of the legs, the legs of the retainer forming at the inner ends of the forked portions and at the enlarged portions thereof bearings engaging the under sides of the studs and bosses at both sides of the barrel around said studs, the connecting portion of the legs of the U-shaped retainer being engageab'le by an abutment on said drill steel, bearings slidably mounted on the fur-cations of said forked portions, said bearings and said studs having portions adapted to interlock with each other to hold the retainer in a drill-steel retaining position, spring retaining plates slidahly mounted at their opposite end on and between the furcations of each leg, nuts at the outer ends of said furcations for holding said spring'retaining plates in position, and compression springs positioned around each of said furcations with their ends bearing against the adjacent sides of said slidable bearings and said spring retaining plates.

In testimony whereof, I have hereunto set my hand at Los Angeles, California this 3rd day of January 1927.

CHARLES A. HULTQUIST. 

